Physical Database Structures:

The subsequent sections explain the physical database structures of an Oracle database, involving datafiles, redo log files and control files.

Datafiles:

Each Oracle database has one or more physical datafiles. The database's datafiles holds all the data of database. A data of logical database structures like as tables and indexes is physically stored in the datafiles allocated for a database. The subsequent are characteristics of datafiles:

A datafile can be related with only one database.

The Database files can have certain characteristics group to permit them to automatically extend when the database runs out of space.